Canal-type earphone having pressure equilibrium structure

Abstract

Disclosed is a canal-type earphone having a pressure equilibrium structure. The canal-type earphone includes: a microspeaker including a frame, a magnetic circuit, a voice coil, and a diaphragm; an earphone housing including an accommodation space accommodating the microspeaker and a nozzle extending to one side of the accommodation space; a vent hole formed at the earphone housing, installed in at least one of portions located in front of the microspeaker in the nozzle and the accommodation space, and allowing air to flow outside and inside the earphone housing; and an eartip coupled to outside of the nozzle of the earphone housing.

What is claimed is: 
     
       1. A canal-type earphone having a pressure equilibrium structure, comprising:
 a microspeaker including a frame, a magnetic circuit, a voice coil, and a diaphragm; 
 an earphone housing including an accommodation space accommodating the microspeaker and a nozzle extending to one side of the accommodation space; 
 a vent hole formed at the earphone housing, installed in at least one of portions located in front of the microspeaker on the nozzle, and allowing air to flow outside and inside the earphone housing; 
 an eartip coupled to outside of the nozzle of the earphone housing, wherein the nozzle includes a recess provided on an outer surface of the nozzle, communicating with the vent hole on the earphone housing, and having a gap with an inner surface of the eartip; 
 a switch bracket rotatably coupled to the earphone housing, adjusting an opening degree of the vent hole, and closing the vent hole; and 
 a vent path defined by the inner surface of the eartip and the recess of the nozzle and communicating with the vent hole on the earphone housing, wherein the switch bracket opens and closes the vent path. 
 
     
     
       2. The canal-type earphone of  claim 1 , further comprising:
 a mesh covering the vent hole. 
 
     
     
       3. The canal-type earphone of  claim 1 , further comprising:
 a sealing member provided between the switch bracket and the earphone housing. 
 
     
     
       4. The canal-type earphone of  claim 1 , wherein:
 the vent hole includes at least one vent hole formed in the one portion located in front of the microspeaker in the accommodation space; and 
 the earphone housing has a conduit provided on an inner surface thereof and communicating with the vent hole. 
 
     
     
       5. The canal-type earphone of  claim 4 , wherein the conduit is formed by a rib protruding from the inner surface of the earphone housing. 
     
     
       6. The canal-type earphone of  claim 1 , further comprising:
 a sound guide bracket coupled to a front surface of the microspeaker and having a guide tube extending into the nozzle. 
 
     
     
       7. The canal-type earphone of  claim 6 , wherein:
 the vent hole includes at least one vent hole formed at a portion located in front of the microspeaker in the accommodation space; and 
 a surface on which the vent hole is formed in the accommodation space and the bracket are spaced apart from each other. 
 
     
     
       8. The canal-type earphone of  claim 7 , further comprising:
 a conduit communicating the vent hole with the nozzle, 
 wherein the conduit is formed by a rib protruding from the inner surface of the earphone housing to the bracket. 
 
     
     
       9. A canal-type earphone having a pressure equilibrium structure, comprising:
 a microspeaker including a frame, a magnetic circuit, a voice coil, and a diaphragm; 
 an earphone housing including an accommodation space accommodating the microspeaker and a nozzle extending to one side of the accommodation space; 
 at least one vent hole formed at the earphone housing, installed in at least one of portions located in front of the microspeaker, in the accommodation space, and allowing air to flow outside and inside the earphone housing; and 
 an eartip coupled to outside of the nozzle of the earphone housing, 
 wherein the earphone housing has a conduit provided on an inner surface of the earphone housing and communicating with the at least one vent hole, 
 wherein the conduit is formed by a rib protruding from the inner surface of the earphone housing and a counterpart attached to the rib. 
 
     
     
       10. The canal-type earphone of  claim 9 , wherein the counterpart is any one of a cover, a tape, a film, and a sheet covering the diaphragm of the microspeaker. 
     
     
       11. The canal-type earphone of  claim 9 , further comprising:
 a mesh covering the at least one vent hole. 
 
     
     
       12. The canal-type earphone of  claim 9 , further comprising:
 a switch bracket rotatably coupled to the earphone housing, adjusting an opening degree of the at least one vent hole, and closing the at least one vent hole. 
 
     
     
       13. The canal-type earphone of  claim 12 , wherein the at least one vent hole is further provided on the nozzle, wherein the nozzle includes a recess provided on an outer surface thereof, communicating with the at least one vent hole on the earphone housing, and having a gap with an inner surface of the eartip, the canal-type earphone further comprising:
 a vent path defined by the inner surface of the eartip and the recess of the nozzle and communicating with the at least one vent hole, wherein the switch bracket opens and closes the vent path. 
 
     
     
       14. The canal-type earphone of  claim 12 , further comprising:
 a sealing member provided between the switch bracket and the earphone housing. 
 
     
     
       15. The canal-type earphone of  claim 9 , further comprising:
 a sound guide bracket coupled to a front surface of the microspeaker and having a guide tube extending into the nozzle.